<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>

<body>
    <div id="app">
        <div>
            <span>姓名:</span>
            <input type="text" v-model="name"/>
        </div>
        <div>
            <span>年龄:</span>
            <input type="number" v-model="age"/>
        </div>
        <div>
            <span>性别:</span>
            <select v-model="selected">
                <option value="男">男</option>
                <option value="女">女</option>
            </select>
        </div>
        <div>
            <button @click="toggle" v-if="isShow">添加/修改</button>
            <button @click="toggle" v-else>添加/修改</button>
        </div>
        <div>
            <table border="1" cellpadding="10" cellspacing="0">
                <tr>
                    <th>序号</th>
                    <th>姓名</th>
                    <th>年龄</th>
                    <th>性别</th>
                    <th>操作</th>
                </tr>
                <tr v-for="(item,index) in list" :key="item.id">
                    <td>{{index+1}}</td>
                    <td>{{item.name}}</td>
                    <td>{{item.age}}</td>
                    <td>{{item.gender}}</td>
                    <td>
                        <button @click="del(item.id)">删除</button>
                        <button @click="edit(item.id)">编辑</button>
                    </td>
                </tr>
            </table>
        </div>
    </div>
    <script src="../vue.js"></script>
    <script>
        const app = new Vue({
            el: '#app',
            data: {
                name:'',
                age:'',
                selected:'',
                curId:'',
                isShow:true,
                list:JSON.parse(localStorage.getItem('newList'))||[]     
            },
            methods:{
                toggle(){
                    if(this.isShow){
                        if (!this.name || !this.age) {
                            return alert('输入信息不能为空');
                        }
                        this.list.push({
                            id: +new Date(),
                            name: this.name,
                            age: this.age,
                            gender: this.selected,
                        });
                    } else{
                    let newArr=this.list.filter((item)=>item.id===this.curId)
                    newArr[0].gender=this.selected;
                    newArr[0].name=this.name;
                    newArr[0].age=this.age;
                    this.isShow=!this.isShow
                    }
                    this.name=''
                    this.age=''
                    this.selected=''
                },
                del(id){
                    this.list=this.list.filter((item)=>item.id!==id);
                },
                edit(id){
                    let newArr=this.list.filter((item)=>item.id===id);
                    this.curId=id;
                    this.id=newArr[0].gender;
                    this.name=newArr[0].name;
                    this.age=newArr[0].age;
                    this.isShow=!this.isShow
                }
            },
            watch:{
                list(newVal){
                    localStorage.setItem('newList',JSON.stringify(newVal))
                }
            }
        })
    </script>
</body>

</html>